Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantos candidatos havia no ano de 1987?
 ###Tabelas: CREATE TABLE notable_villains (notable_villains_id AUTO_INCREMENT PRIMARY KEY, Character VARCHAR, Portrayed by VARCHAR, Crime VARCHAR, First appearance VARCHAR, Last appearance VARCHAR) CREATE TABLE disc_1 (disc_1_id AUTO_INCREMENT PRIMARY KEY, English translation VARCHAR, Original album VARCHAR, Lyricist(s) VARCHAR, Composer(s) VARCHAR, Time VARCHAR) CREATE TABLE summary_of_general_election_performance (summary_of_general_election_performance_id AUTO_INCREMENT PRIMARY KEY, Year VARCHAR, Number of Candidates INT, Total votes INT, Average voters per candidate INT, Percentage of vote VARCHAR, Saved deposits INT, Change (percentage points) VARCHAR, Number of MPs INT) CREATE TABLE specimen_data (specimen_data_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Discovered INT, Museum VARCHAR, Museum city VARCHAR, Discoverer VARCHAR, Formation VARCHAR, Location VARCHAR) CREATE TABLE acute_toxicity (acute_toxicity_id AUTO_INCREMENT PRIMARY KEY, Method of administration[ citation needed ] VARCHAR, Category 1 INT, Category 2 INT, Category 3 VARCHAR, Category 4 VARCHAR, Category 5 VARCHAR)  
SELECT Number of Candidates FROM summary_of_general_election_performance WHERE Year = 1987